Molecular structures and charge-transfer complexes of cis-dibenzo[c,h]-1,6-disilabicyclo[4.4.0]deca-3,8-dienes and bi(benzo[c]silacyclopent-3-ene-1-yl)s
作者:Soichiro Kyushin、Masanobu Ikarugi、Satoshi Tsunakawa、Yukiko Izumi、Michihiro Miyake、Mitsuo Sato、Hideyuki Matsumoto、Midori Goto
DOI:10.1016/0022-328x(94)80101-0
日期:1994.6
The reaction of the di-Grignard reagent of alpha,alpha'-dichloro-o-xylene with Cl2RSiSiRCl2 (R =(i)Pr and Me) produced cis-dibenzo[c,h]-1,6-dialkyl-1,6-disilabicyclo[4.4.0]deca-3,8-diene (1) and bi(benzo[c]-1-alkylsilacyclopent-3-ene-1-yl) (2). The structures of 1a (R = (i)Pr) and 2a (R =(i)Pr) were determined by X-ray crystallography. Crystal data for 1a: orthorhombic, Pbca, a = 14.816(1), b = 16.263(1), c = 17.257(1) angstrom, V = 4158.1(3) angstrom3, Z = 8, R = 0.040, R(w) = 0.050 for 2008 reflections. Crystal data for 2a: triclinic, P1BAR, a = 8.179(2), b = 10.389(3), c = 6.605(2) angstrom, alpha = 100.39(2)degrees, beta = 98.29(2)degrees, gamma = 106.75(2)degrees, V = 517.0(3) angstrom3, Z = 1, R = 0.042, R(w) = 0.051 for 1167 reflections. Compounds 1 and 2 have relatively low oxidation potentials (1.24-1.59 V vs. SCE, in acetonitrile) and form charge-transfer complexes with tetracyanoethylene (TCNE). In the case of 2a, the charge-transfer complex was isolated as red crystals and the structure was determined by X-ray crystallography. Crystal data for the 2a-TCNE complex: triclinic, P1BAR, a = 6.8399(8), b = 8.2836(6), c = 12.868(1) angstrom, alpha = 84.142(6), beta = 88.737(6)degrees, gamma = 66.801(8), V= 666.5(1) angstrom3, Z = 1, R = 0.038, R(w) = 0.042 for 1554 reflections.